Abstract: A heat exchanger consists of an exhaust flow conduit mounted on and connected to the exhaust manifold. A partially enclosing housing or jacket defines a vaporizing chamber. A conduit communicates the vaporizing chamber with the inlet air throat for the intake manifold. A blending device mounted on the heat exchanger housing includes a mixing chamber for receiving an inert gas such as exhaust gas and one or more liquid fuel components. The mixing chamber may include a venturi whereby the flow of exhaust gas under pressure will draw liquid fuel and effect the mixing, vaporization and flow of that fuel mixture to the intake throat. The flow of the inert gas may be controlled in relation to the flow of inlet air. In another version the fuels are supplied to the blending device under pressure and under volume control related to the flow of inlet air, with the flow of pressurized exhaust gas effecting the flow of the vaporized fuel mixture through the heat exchanger to the inlet throat.

Abstract: A fuel charging device includes a housing having two transverse bores, one defining a mixing chamber and one defining a vaporizing chamber. A section of exhaust bypass conduit passes through the vaporizing chamber bore to provide an annular chamber. A plurality of fuel flow channels consist essentially of transverse bores intersecting the vaporizing chamber and mixing chamber bores. These fuel flow channels include a valve chamber, a feed chamber communicating the valve chamber and the vaporizing chamber, and passages communicating the vaporizing chamber and the mixing chamber. Metering valves include valve orifices disposed between the valve chamber and the feed chamber, and needle valves at the end of valve actuator stems which extend through the valve chamber and beyond the housing. Liquid fuel inlet passages communicate with the valve chambers.